Speedometer.



PATENTED JULY '7, 1908.

D. H. HAYWOOD.

SPEEDOMETER.

APPLICATION FILED SEPT. s, 1906.

2 SHEETS-SHEET 1.

S INVENTOR WITNESSES:

PATENTED JULY 7, 1908. D. H. HAYWOOD.

SPEEDOMETER.

APPLICATION FILED SEPT. s,

2 SHEBTSSHEBT 2.

speedometers, and

DANIEL HOWARD HAYWOOD, OF YORK, N. Y., ASSIGNOR NEW YORK, N. Y.

To JOSIAH M. FISKE, or

srnnnomrmn.

To all whom itmay concern:

Be it known that I, DANIEL HOWARD HAYWOOD, a citizen of the UnitedStates of America, and a resident of the city, county, and State of NewYork, have invented certain new and useful Im rovements in Speedometers,of which the ollowing is a 'specification, reference being had to theaccompanying drawings, forming a part thereof.

y invention relates toimprovements in particularly to speedometersadapted to be em loyed for indicating the speed of moving ve icles:

The particular class of speedometers to which my present inventionrelates is that class in which distance intervalsare measured duringpredetermined intervals oftime, the speed at which the distance traveledduring such intervals of time being successively indicated in thedevice; and the main objectsof my invention are to improve and siminstruments of this character, to ren er the operation thereof morepositive and accurate, and to provide that the time mechanism shall berequired to do but a minimum of work. I

To these ends my invention consists in certain novel features ofconstruction and com bination of parts, and, in order that my inventionmay be fully understood, I will describe in detail an embodiment thereofas illustrated in the accompanying drawings, and will then point out thenovel features in claims.

In the drawings: Figure 1 is a view in front elevation of an instrumentconstructed in accordance with my invention. Fig. 2 is a similar viewwith the front of the casing removed and a part of the frame brokenaway. Fig. 3 is a view in central vertical section through theinstrument, the section being taken substantially upon the line 33 ofFig.2. Fig. 4 is a detail view on an enlarged scale of certain parts ofthe instrument including the driving and driven wheels, the

stop wheel, the rotative latch, and other corelated and co-acting parts.Fig. 5 is a view at right angles thereto, showing the relation betweenthe rotative latch and the sto wheel. Fig. 6 is a detail view of aclocli train employed.

The distance measuring mechanism comprises a shaft 10, which may beconnected in the usual or any desired manner with one of the wheelsofthe vehicle whose speed'is to be Specification of Letters Patent.

Application filed September 8, 1906. Serial No. 333,751.

Patented July '7, loos.

tates proportionately to thedistance covered,.a worm 11 secured uponsaid shaft, a

worm Wheel12 engaged by said worm 1 1 ,a spur gear 13 secured to rotatewith said worm whgel 12, another spur gear 14 mesh with sa1 ment 15mounted to rotate with said gear 14.

The spur gear 14 and driving element 15 are mounted to rotate in aswinging framework 17 pivotally mounted upon the axle of the spur gear13 and worm wheel 12. The driving element 15, which is here shown in theform of a friction disk, has its riphery normally in contact with theperip cry of a driven member 18. This driven member is mounted to rotate"freely u on a central stud 19, and -a spring 20, secure at one end tothe said member 18, and at the other end to a stationary part of theinstrument, tends normally return'the said element to a normal position,such movement being in a direction opposite to the direction in whlchthe arrow.s' point in Figs. 2 and 4 of the drawing spur spurgear 13,,anda friction' driving 'elethe path of movement of a shoulder 22 u on themember 18, said abutment and shou der forming a limiting stop, which.limits the return movement of the member 18 under the influence of thesprin 20, as will be well understood. The mom er 18 is driven in thedirection of the arrows in the drawings for so long a time as thedriving member 15 is in contact therewith,'and the said driving memberis ke t normally in contact therewith by means 0 a spring 23, which isconnected at one end with the swinging frame, and,'at the other end,with a part of the main frame 24 of the instrument. At predeterminedintervals of time the said frame 16 is rocked upon its support so as tomomentarily release-the said driving member 15 from the driven member18, to thereby allow the said driven member to return to its normalposition, as above stated. This movement of the rockingframe :is broughtabout by means of a cam wheel 26, the cam projections of whichintermittently engage a cam follower 27 u on the swinging frame 16, thesaid cam whee 26 bein driven by and timed from a clock train 25 w 'chconstitutes a time mechanism. It will then be readily understood fromthe foregoinglthat the driven member 18 is drivenil'f' the rection ofthe arrow a distance proportional to the extent of rotation of the shaft10 for successive predetermined intervals of time, the said drivenmember being permitted to return to a zero position at the end of eachsaid interval of time. For the purpose of indicating the extent ofrotative movement of the member 18, I have provided an indicator 28which is mounted loosely upon the studlQ, but provided with a spring 29which normally tends to return it to a zero position. The driven member18 has a stud 01' projection 30 which is adapted to engage an abutment31 carried by the said indicator 28, so that, as the driven wheelmovesin the direction of-the arrow in the drawings, it may engage the saidindicator and move it in such direction. When first starting up, theabutment 31 will rest against the stud 30, so that the indicator 28 willpartake of all the movement of the same member 18. I provide means,however, for preventin the return movement of the indicator-28 w hen thesaid member 18 returns to its initial position, said means comprising astop wheel 32 mounted loosely upon the stud 18, a ratchet wheel 33secured fast to the indicator 28, a spring pressed pawl 34 carried bythe stop wheel 32 and engaging the teeth of the ratchet wheel 33, and arotative latch 35 which normally engages the teeth of the stop wheel 32.

The ratchet and pawl connection between the indicator 23 and the stopwheel 32 holds the indicator 28 positively against rearward movementwith respect to the said stop wheel,

but permits free forward movement thereof. The stop wheel is normallyheld against movement in either direction by the rotative latch 35, butthe said rotative latch is provided with an opening or notch 36 (seeFig. 5) which, in one position, releases the latch from engagement withthe teeth of the stop wheel 32, as will be well understood by referenceto the drawings. The rotative latch is driven from the clock train 25,and thus is timed in direct relation to the timing of the cam .26. Thesaid latch is arranged to release and again engage the stop wheel 32just prior to the tilting movement given to the frame 16 by the cam 26,and hence the release and return movement of the member 18. reduced andthe member 18 is hence traveling a shorter distance in the direction ofthe arrow during the predetermined time interval, the indicator 28,which has been held against return movement, will be allowed to dropback until stopped by the pin 30 upon the member 18, and will be againheld against further return movement by the rotatlon of the latch 35 toreengage said stop wheel, just prior to the moment themember 18 ispermitted to return to its normal position. Any

forward movement, however, which is given to the member 18 in the briefspace of time between the moment the latch 35 again picks Thus, if thespeed of the vehicle is being up and holds the stop wheel 32 and thetime the member 18 is released, will be readily partaken of by theindicator 28, because of the ratchet and pawl connection 33, 34 and, forthe same reason, should the s eed of the vehicle be suddenly increased,rorward movements of the indicator 28 will be in no wise opposed whenthe pin 30 engages the abutment 31 rior to the release movement of therotative atch 35.

The indicator 28 is arranged to register with a graduated scale 37,which is supported by the frame 24 of the instrument, the said graduatedscale so. proportioned as to indicate speed in proportion to thedistance traveled during the redetrmined time intervals. Thus, theinstrument is arranged to constantly indicate successive rates of speedat the end of each time interval, the indicator being held steady duringsubstantially all of each of the said time intervals, whereby a readingmay be readily and accurately taken atany time. The time intervals maybe quite short-the shorter the intervals the greater the accuracy of theinstrument.

It will be noted that the mechanism in its operation requires but aminimum of power, especially the parts operated from the time mechanism.The rotative latch will positively hold the sto wheel 32 againstmovement, yet the ho ding of thestop wheel against such movement offerspractically no resistance to the rotative movement of the said latch,such resistance being longitudinal with respect to the axis of the saidlatch, and not transverse thereto. The tilting of the frame 16 takesplace only momentarily after certain intervals of time, and requires buta minimum of power for its operation.

I have shown a casing 38 as inclosing the mechanism above described,said casing being provided with a window 39 through whic the scale 37may be seen, and Ihave shown a clock face 40, the hands of which aredriven by the time mechanism 25, whereby the instrument may convenientlyindicate time as well as speed of the vehicle.

What I. claim is:

1. A speedometer comprising a driven actuating member, driving means innormal driving relation therewith, means for returning the actuatingmember to a normal zero )osition, and means for releasing said memerfrom enga ement with the driving means to permit such return movement atpredetermined intervals of time, a sprin returned indicator adapted tobe engaged irectly by said actuating member, a stop wheel, means forpositively locking said stop wheel against movement and for momentarilyreleasing same at predetermined intervals, and a connection between saidstop wheel and said indicator, said connection permitting movementbetween them in one direction, but preventing such movement in theother.

2. A speedometer comprising a driven actuating member, driving means innormal driving relation therewith, means for returning the actuatingmember to a normal zero position, and means for releasing said membarfrom engagement with the'driving means to permit such return movement atpredetermined intervals of time, a spring returned indicator adapted tobe engaged directly by said actuating member, astop wheel arranged to befree at all times from engagement with said actuating member, but havinga connection for engagement with said indicator in one direction ofrotation, and means intermittently operated for holding and releasingsaid stop wheel.

3. A speedometer comprising a spring returned actuating wheel, a freelymounted stop wheel, and a spring returned indicator, all mountedconcentrically with respect to each other, means carried by saidactuating wheel to engage said indicator in direct free abuttingrelation therewith, a ratchet and pawl connection between said indicatorand said stop wheel, and means intermittently operated for alternatelyholding and releasing said stop wheel.

4. A speedometer comprising a driven actuating member, driving means innormal driving relation therewith, a spring for returning the actuatingmember to anormal zero position, and means for releasing the said memberfrom its engagement with the driving means to permit said returnmovement at predetermined intervals of time, a spring returned indicatoradapted to be engagec by said actuating member, a stop wheel, aconnection between said stop wheel and said indicator, and means fornormally holding and momentarily releasing said stop wheel.

5. A speedometer comprising a driven actuating member, driving means innormal driving relation therewith, a spring for normally returning theactuating member to a zero position, and means for releasing the saidmember from its engagement with the driving means to permit said returnmovement at predetermined intervals of time, a spring returned indicatoradapted to be engaged by said actuating member, a stop Wheel, a ratchetand pawl connection between said stop wheel and said indicator, andmeans for normally holdingand momentarily releasing said stop wheel.

6. A speedometer comprising means for successively measuring distanceduring units of time, provided with a s ring returned indicator, a stwheel there 'or, a ratchet and pawl connection between said stop wheeland said indicator, holding means for said stop Wheel, and means formomentarily releasing operative engagement of said holding means withsaid sto wheel.

7. A spee ometer comprising means for successively measuring distanceduring units of time, provided with a spring returned indicator, a stopwheel therefor, a ratchet and pawl connection between said stop wheeland said indicator, holdin means for said stop heel, and a rotativelatch normally engaging said stop wheel, provided with a cutawayportion'which in the rotation of the said latch, causes momentarilydisengagement thereof from the stop wheel.

8. A speedometer comprising a driven actuatingmember, driving means innormal driving relation therewith, a spring for normally returning theactuating member to a zero position, and means for releasing the saidmember from its engagement with the driving means to permit said returnmovement at predetermined intervals of time, a sprin returned indicatoradapted to be engage by said actuating member, a stop Wheel, a ratchetand pawl connection between said stop wheel and said indicator, arotative latch normally engaging said stop wheel, provided with acut-away portion which in the rotation of said latch causes momentarilydisengagement from the stop wheel, and means, timed with relation to thesaid releasing means, to cause such disengagement and the reengagementthereof, just prior to a said releasing operation for the actuatingmember.

9. A. speedometer comprising actuating means operated in accordancewith, distance traveled, and a spring returned indicator therefor, timemechanism controlling said actuating means, a stop wheel 32, a ratchetand pawl connection between said actuating means and said stop wheel 32,and arotative latch 35, having a cut-away portion'36, said rotativelatch operated by said time mechanism. v

D. HOWARD HAYWOOD. Witnesses:

HARRY. Goss, J. WARES BoYoE.

